diff --git a/arch/arm/src/stm32/stm32_serial.c b/arch/arm/src/stm32/stm32_serial.c
index 9a35b4e0267..8f774838da6 100644
--- a/arch/arm/src/stm32/stm32_serial.c
+++ b/arch/arm/src/stm32/stm32_serial.c
@@ -1,7 +1,7 @@
 /****************************************************************************
  * arch/arm/src/stm32/stm32_serial.c
  *
- *   Copyright (C) 2009-2014, 2016 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2009-2014, 2016, 2017 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -70,6 +70,7 @@
 /****************************************************************************
  * Pre-processor Definitions
  ****************************************************************************/
+
 /* Some sanity checks *******************************************************/
 /* DMA configuration */
 
@@ -1771,7 +1772,7 @@ static void up_detach(struct uart_dev_s *dev)
  *   interrupt received on the 'irq'  It should call uart_transmitchars or
  *   uart_receivechar to perform the appropriate data transfers.  The
  *   interrupt handling logic must be able to map the 'irq' number into the
- *   approprite uart_dev_s structure in order to call these functions.
+ *   appropriate uart_dev_s structure in order to call these functions.
  *
  ****************************************************************************/
 
@@ -2595,7 +2596,7 @@ static void up_dma_rxcallback(DMA_HANDLE handle, uint8_t status, void *arg)
  * Input Parameters:
  *
  *    cb - Returned to the driver. The driver version of the callback
- *         strucure may include additional, driver-specific state data at
+ *         structure may include additional, driver-specific state data at
  *         the end of the structure.
  *
  *    pmstate - Identifies the new PM state
@@ -2661,7 +2662,7 @@ static void up_pm_notify(struct pm_callback_s *cb, int domain,
  * Input Parameters:
  *
  *    cb - Returned to the driver. The driver version of the callback
- *         strucure may include additional, driver-specific state data at
+ *         structure may include additional, driver-specific state data at
  *         the end of the structure.
  *
  *    pmstate - Identifies the new PM state